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using System;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Math;
namespace Org.BouncyCastle.Asn1.Pkcs
{
public class MacData
: Asn1Encodable
{
public static MacData GetInstance(object obj)
{
if (obj == null)
return null;
if (obj is MacData macData)
return macData;
return new MacData(Asn1Sequence.GetInstance(obj));
}
public static MacData GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit)
{
return new MacData(Asn1Sequence.GetInstance(taggedObject, declaredExplicit));
}
private readonly DigestInfo m_digInfo;
private readonly Asn1OctetString m_salt;
private readonly DerInteger m_iterationCount;
private MacData(Asn1Sequence seq)
{
int count = seq.Count, pos = 0;
if (count < 2 || count > 3)
throw new ArgumentException("Bad sequence size: " + count, nameof(seq));
m_digInfo = DigestInfo.GetInstance(seq[pos++]);
m_salt = Asn1OctetString.GetInstance(seq[pos++]);
m_iterationCount = Asn1Utilities.ReadOptional(seq, ref pos, DerInteger.GetOptional) ?? DerInteger.One;
if (pos != count)
throw new ArgumentException("Unexpected elements in sequence", nameof(seq));
}
public MacData(DigestInfo digInfo, byte[] salt, int iterationCount)
{
m_digInfo = digInfo ?? throw new ArgumentNullException(nameof(digInfo));
m_salt = new DerOctetString(salt);
m_iterationCount = new DerInteger(iterationCount);
}
public DigestInfo Mac => m_digInfo;
public byte[] GetSalt() => (byte[])m_salt.GetOctets().Clone();
public BigInteger IterationCount => m_iterationCount.Value;
/**
* <pre>
* MacData ::= SEQUENCE {
* mac DigestInfo,
* macSalt OCTET STRING,
* iterations INTEGER DEFAULT 1
* -- Note: The default is for historic reasons and its use is deprecated. A
* -- higher value, like 1024 is recommended.
* </pre>
* @return the basic DERObject construction.
*/
public override Asn1Object ToAsn1Object()
{
return m_iterationCount.HasValue(1)
? new DerSequence(m_digInfo, m_salt)
: new DerSequence(m_digInfo, m_salt, m_iterationCount);
}
}
}
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